in_array

• We can check if an element exists in a Ruby array using Array#include?.

  PHP’s in_array has a strict argument that will consider object type. Ruby does not consider a Fixnum of 1 and a String of '1' to be the same thing, and will always operate in the equivalent of PHP’s strict = true argument for this function.

  PHP

  $fruit = array('apple', 'banana', 'kiwi');
  $result = in_array('apple', $fruit, true);
  var_export($result);
  // => true

  Ruby

  fruit = ["apple", "banana", "kiwi"]
  p fruit.include?("apple")
  # => true

  Just like PHP, Ruby can check for an element’s existence in an array even if that element is an array (or any object).

  PHP

  $list = array(array('a', 'b'), 'c');
  $result = in_array(array('a', 'b'), $list);
  var_export($result);
  // => true

  Ruby

  list = [["a", "b"], "c"]
  p list.include?(["a", "b"])
  # => true

  see also

  • array_search
  • array_key_exists

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